Gaspricewatch.com aims to return “power to the people at the pump” by helping them find the best rates for any fuel type. The site tracks prices with a live feed and works with 163,000 volunteer drivers to maintain a database of more than 128,000 stations nationwide.

Gasbuddy.com not only helps you locate gas stations in your area with the most reasonable rates but also provides gas-price maps, tracks the lowest average prices by city and state, and charts changes in price from yesterday to a year ago.

Gasprices.mapquest.com lets you search for the lowest prices for gasoline, diesel, and alternative fuels. It also features a gas calculator to help you estimate how much a road trip will cost.

AAA.com organizes its tips by zip code. Tell the site where you are, and it will provide a customized fuel savings guide.